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Fencer Intel
medium 4.9

CVE-2011-4086 json

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwrit…

published 2012-07-03 14 y ago modified 2026-06-16 4 mo ago also EUVD-2011-4037

cvss
4.9
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 33%
public exploits
0
none known

Summary

The journal_unmap_buffer function in fs/jbd2/transaction.c in the Linux kernel before 3.3.1 does not properly handle the _Delay and _Unwritten buffer head states, which allows local users to cause a denial of service (system crash) by leveraging the presence of an ext4 filesystem that was mounted with a journal.

Patch / fix

  • kernel RHEL 6 2.6.32-220.17.1.el6
  • perf RHEL 6 2.6.32-220.17.1.el6
  • python-perf RHEL 6 2.6.32-220.17.1.el6
  • kernel-kdump RHEL 6 2.6.32-220.17.1.el6
  • kernel-firmware RHEL 6 2.6.32-220.17.1.el6
  • kernel-bootwrapper RHEL 6 2.6.32-220.17.1.el6
  • kernel-debuginfo-common-i686 RHEL 6 2.6.32-220.17.1.el6
  • kernel-debuginfo-common-ppc64 RHEL 6 2.6.32-220.17.1.el6

red hat advisories RHSA-2012:0571RHSA-2012:0107RHSA-2012:0670

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2011-4086 updated cvss 4.9

kernel: jbd2: unmapped buffer with _Unwritten or _Delay flags set can lead to DoS

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-274.18.1.el5, kernel-PAE 2.6.18-274.18.1.el5, kernel-xen 2.6.18-274.18.1.el5, kernel-kdump 2.6.18-274.18.1.el5, kernel-debuginfo-common 2.6.18-274.18.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-274.18.1.el5, kernel-PAE 2.6.18-274.18.1.el5, kernel-xen 2.6.18-274.18.1.el5, kernel-kdump 2.6.18-274.18.1.el5, kernel-debuginfo-common 2.6.18-274.18.1.el5
    fixed: vendor fix RHSA-2012:0107
  • Red Hat Enterprise Linux Desktop (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux Desktop Optional (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux HPC Node (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux HPC Node Optional (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux Server (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux Server Optional (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more Red Hat Enterprise Linux Workstation Optional (v. 6) perf 2.6.32-220.17.1.el6, kernel 2.6.32-220.17.1.el6, python-perf 2.6.32-220.17.1.el6, kernel-kdump 2.6.32-220.17.1.el6, kernel-firmware 2.6.32-220.17.1.el6, kernel-bootwrapper 2.6.32-220.17.1.el6, +4 more
    fixed: vendor fix RHSA-2012:0571
  • Red Hat MRG Realtime for RHEL 6 Server v.2 kernel-rt 3.0.30-rt50.62.el6rt, kernel-rt-trace 3.0.30-rt50.62.el6rt, kernel-rt-vanilla 3.0.30-rt50.62.el6rt, kernel-rt-firmware 3.0.30-rt50.62.el6rt, kernel-rt-debuginfo-common-x86_64 3.0.30-rt50.62.el6rt
    fixed: vendor fix RHSA-2012:0670

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.39% chance of exploitation in the next 30 days, higher than 33% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
Technology feeds

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.